Have you tried the discs in any other system? How do you know that you are burning a valid image to the disc that can even be recognized by Windows?
If you have a proper, Windows readable .ISO that you are starting with, you should be able to mount and browse the image with any virtual optical drive emulator. I have used and recommend both Daemon-Tools Lite and Slysoft's Virtual CloneDrive to work with .ISO images, although I'm sure there are plenty of other software solutions.
If your computer has Windows 8 or newer installed, it can natively mount and browse .ISO files.
I would suggest, instead of burning a bunch of discs, start first by writing to a .ISO image file. Mount the file after it is created and see if Windows will read it. If not, you saved yourself a blank disc.
Another thing to consider is, there are formats of discs that Windows may not recognize. It doesn't mean the disc is defective, just that Windows can't browse the disc and show the contents to you. If you happen to have a disc image that Windows can't natively browse, it still may work for it's intended purpose, such as booting the computer into a different operating system, etc.
You can still create valid discs in formats that Windows doesn't recognize. Unless you are authoring the disc from beginning to end using Nero and ImgBurn, you are only going to be writing a series of bits to the blank disc. They don't have to understand what those bits mean unless they author them.
The original discs open fine in the original system and another system with xp. So i know there is a valid image. However when its copied the discs its copied to verifies as the process being complete but then just gets seen as being a blank disc.
One discs is just a data disc with a compressed file on there. Windows should see this format fine.
I have tried a number of different discs to copy from and same issue. Burnt disc is always invalid.
I suggest burning to or creating an image file, mounting that, and verifying your software is producing valid results. If the .ISO is able to be mounted and browsed, there is an issue between your computer and the disc burner.
Have you tried burning the disc at the lowest possible speed? Not all blank discs are rated for writing at all speeds.
Do your burners that you have tried have under-run protection and is it turned on in your burning software?
How have you verified that the data being copied from the original discs is being copied correctly? Commercial discs can have copy prevention mechanisms built into them. We can not help you circumvent anything of this nature here.
First things first though, you need to ensure you are extracting valid data from the original disc before you try writing it to a new one. You should be able to use a program such as Daemon-Tools Lite to extract an image of the original disc to a .ISO on your hard drive. At that point, you should be able to mount the .ISO image in Daemon-Tools Lite and use it as though it were the original disc. Until you can get this step to work, I wouldn't bother trying to go further with the process to burn a copy.
You haven't quite clarified yet whether the discs, after being written to, can be read by any system other than the computer presenting you the problem for which you're seeking help. Have you tried to read the discs in another system?
If the discs are being seen as blank, are you then able to re-run the process of burning data to the same disc? The reason I ask is, some disc burning software has what might be called a "simulation" mode where, it goes through the entire process, except doesn't actually burn the disc. It is used to verify that the process will complete successfully without wasting a blank disc if it fails. If your software is capable of simulating writing to the disc, make sure you are not doing that by mistake.
Also, make sure the disc or session is being closed after writing, unless you are specifically writing in a packet mode. While your XP system should read the disc fine even if it isn't closed, it's not guaranteed that it will, and non-PC devices may refuse to read the disc as well.
Sorry guys i think i have confused people. One cd i tried to copy is hirens boot cd which contains an iso image.
The other discs are just data discs mate up of pdf,jpeg files etc.... Tried at least 3 different data discs no joy. I can see the data has been burnt to the disc on the underside of the cd but windows thinks its blank.